Wario Land II is set after the events of Wario Land: Super Mario Land 3 . Special agents from the Black Sugar Gang of Kitchen Island sneak into Wario's newly built castle, steal back the treasure, and leave the castle and the surrounding area a mess. As the player, you must clean up the place and take back what you now call your own.
The gameplay in Wario Land II is an action-adventure style platformer. In a change from the original Wario Land , Wario is now immortal to a certain point. Instead of dying when hit by an enemy, you lose the coins collected along your travels in each level. You can also turn into other Warios, such as Fire Wario or Zombie Wario, which can have advantages like accessing new areas or halting progress.
Wario Land II was released for the Game Boy on 26 March 1998.